define(function(require, exports, module){
	/*

	Holder - 1.9 - client side image placeholders
	(c) 2012-2013 Ivan Malopinsky / http://imsky.co

	Provided under the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
	Commercial use requires attribution.

	*/

	var Holder = Holder || {};
	(function (app, win) {

	var preempted = false,
	fallback = false,
	canvas = document.createElement('canvas');

	//getElementsByClassName polyfill
	document.getElementsByClassName||(document.getElementsByClassName=function(e){var t=document,n,r,i,s=[];if(t.querySelectorAll)return t.querySelectorAll("."+e);if(t.evaluate){r=".//*[contains(concat(' ', @class, ' '), ' "+e+" ')]",n=t.evaluate(r,t,null,0,null);while(i=n.iterateNext())s.push(i)}else{n=t.getElementsByTagName("*"),r=new RegExp("(^|\\s)"+e+"(\\s|$)");for(i=0;i<n.length;i++)r.test(n[i].className)&&s.push(n[i])}return s})

	//getComputedStyle polyfill
	window.getComputedStyle||(window.getComputedStyle=function(e,t){return this.el=e,this.getPropertyValue=function(t){var n=/(\-([a-z]){1})/g;return t=="float"&&(t="styleFloat"),n.test(t)&&(t=t.replace(n,function(){return arguments[2].toUpperCase()})),e.currentStyle[t]?e.currentStyle[t]:null},this})

	//http://javascript.nwbox.com/ContentLoaded by Diego Perini with modifications
	function contentLoaded(n,t){var l="complete",s="readystatechange",u=!1,h=u,c=!0,i=n.document,a=i.documentElement,e=i.addEventListener?"addEventListener":"attachEvent",v=i.addEventListener?"removeEventListener":"detachEvent",f=i.addEventListener?"":"on",r=function(e){(e.type!=s||i.readyState==l)&&((e.type=="load"?n:i)[v](f+e.type,r,u),!h&&(h=!0)&&t.call(n,null))},o=function(){try{a.doScroll("left")}catch(n){setTimeout(o,50);return}r("poll")};if(i.readyState==l)t.call(n,"lazy");else{if(i.createEventObject&&a.doScroll){try{c=!n.frameElement}catch(y){}c&&o()}i[e](f+"DOMContentLoaded",r,u),i[e](f+s,r,u),n[e](f+"load",r,u)}};

	//https://gist.github.com/991057 by Jed Schmidt with modifications
	function selector(a){
		a=a.match(/^(\W)?(.*)/);var b=document["getElement"+(a[1]?a[1]=="#"?"ById":"sByClassName":"sByTagName")](a[2]);
		var ret=[];	b!=null&&(b.length?ret=b:b.length==0?ret=b:ret=[b]);	return ret;
	}

	//shallow object property extend
	function extend(a,b){var c={};for(var d in a)c[d]=a[d];for(var e in b)c[e]=b[e];return c}

	//hasOwnProperty polyfill
	if (!Object.prototype.hasOwnProperty)
		Object.prototype.hasOwnProperty = function(prop) {
			var proto = this.__proto__ || this.constructor.prototype;
			return (prop in this) && (!(prop in proto) || proto[prop] !== this[prop]);
		}

	function text_size(width, height, template) {
		var dimension_arr = [height, width].sort();
		var maxFactor = Math.round(dimension_arr[1] / 16),
			minFactor = Math.round(dimension_arr[0] / 16);
		var text_height = Math.max(template.size, maxFactor);
		return {
			height: text_height
		}
	}

	function draw(ctx, dimensions, template, ratio) {
		var ts = text_size(dimensions.width, dimensions.height, template);
		var text_height = ts.height;
		var width = dimensions.width * ratio,
			height = dimensions.height * ratio;
		var font = template.font ? template.font : "sans-serif";
		canvas.width = width;
		canvas.height = height;
		ctx.textAlign = "center";
		ctx.textBaseline = "middle";
		ctx.fillStyle = template.background;
		ctx.fillRect(0, 0, width, height);
		ctx.fillStyle = template.foreground;
		ctx.font = "bold " + text_height + "px " + font;
		var text = template.text ? template.text : (dimensions.width + "x" + dimensions.height);
		if (ctx.measureText(text).width / width > 1) {
			text_height = template.size / (ctx.measureText(text).width / width);
		}
		//Resetting font size if necessary
		ctx.font = "bold " + (text_height * ratio) + "px " + font;
		ctx.fillText(text, (width / 2), (height / 2), width);
		return canvas.toDataURL("image/png");
	}

	function render(mode, el, holder, src) {
		var dimensions = holder.dimensions,
			theme = holder.theme,
			text = holder.text ? decodeURIComponent(holder.text) : holder.text;
		var dimensions_caption = dimensions.width + "x" + dimensions.height;
			
		theme = (text ? extend(theme, {
			text: text
		}) : theme);
		theme = (holder.font ? extend(theme, {
			font: holder.font
		}) : theme);

		if (mode == "image") {
			el.setAttribute("data-src", src);
			el.setAttribute("alt", text ? text : theme.text ? theme.text + " [" + dimensions_caption + "]" : dimensions_caption);

			if (fallback || !holder.auto) {
				el.style.width = dimensions.width + "px";
				el.style.height = dimensions.height + "px";
			}

			if (fallback) {
				el.style.backgroundColor = theme.background;

			} else {
				el.setAttribute("src", draw(ctx, dimensions, theme, ratio));
			}
		} else {
			if (!fallback) {
				el.style.backgroundImage = "url(" + draw(ctx, dimensions, theme, ratio) + ")";
				el.style.backgroundSize = dimensions.width + "px " + dimensions.height + "px";
			}
		}
	};

	function fluid(el, holder, src) {
		var dimensions = holder.dimensions,
			theme = holder.theme,
			text = holder.text;
		var dimensions_caption = dimensions.width + "x" + dimensions.height;
		theme = (text ? extend(theme, {
			text: text
		}) : theme);

		var fluid = document.createElement("div");

		if (el.fluidRef) {
			fluid = el.fluidRef;
		}

		fluid.style.backgroundColor = theme.background;
		fluid.style.color = theme.foreground;
		fluid.className = el.className + " holderjs-fluid";
		fluid.style.width = holder.dimensions.width + (holder.dimensions.width.indexOf("%") > 0 ? "" : "px");
		fluid.style.height = holder.dimensions.height + (holder.dimensions.height.indexOf("%") > 0 ? "" : "px");
		fluid.id = el.id;

		el.style.width = 0;
		el.style.height = 0;

		if (!el.fluidRef) {

			if (theme.text) {
				fluid.appendChild(document.createTextNode(theme.text))
			} else {
				fluid.appendChild(document.createTextNode(dimensions_caption))
				fluid_images.push(fluid);
				setTimeout(fluid_update, 0);
			}

		}

		el.fluidRef = fluid;
		el.parentNode.insertBefore(fluid, el.nextSibling)

		if (window.jQuery) {
			jQuery(function ($) {
				$(el).on("load", function () {
					el.style.width = fluid.style.width;
					el.style.height = fluid.style.height;
					$(el).show();
					$(fluid).remove();
				});
			})
		}
	}

	function fluid_update() {
		for (i in fluid_images) {
			if (!fluid_images.hasOwnProperty(i)) continue;
			var el = fluid_images[i],
				label = el.firstChild;

			el.style.lineHeight = el.offsetHeight + "px";
			label.data = el.offsetWidth + "x" + el.offsetHeight;
		}
	}

	function parse_flags(flags, options) {

		var ret = {
			theme: settings.themes.gray
		}, render = false;

		for (sl = flags.length, j = 0; j < sl; j++) {
			var flag = flags[j];
			if (app.flags.dimensions.match(flag)) {
				render = true;
				ret.dimensions = app.flags.dimensions.output(flag);
			} else if (app.flags.fluid.match(flag)) {
				render = true;
				ret.dimensions = app.flags.fluid.output(flag);
				ret.fluid = true;
			} else if (app.flags.colors.match(flag)) {
				ret.theme = app.flags.colors.output(flag);
			} else if (options.themes[flag]) {
				//If a theme is specified, it will override custom colors
				ret.theme = options.themes[flag];
			} else if (app.flags.text.match(flag)) {
				ret.text = app.flags.text.output(flag);
			} else if (app.flags.font.match(flag)) {
				ret.font = app.flags.font.output(flag);
			} else if (app.flags.auto.match(flag)) {
				ret.auto = true;
			}
		}

		return render ? ret : false;

	};



	if (!canvas.getContext) {
		fallback = true;
	} else {
		if (canvas.toDataURL("image/png")
			.indexOf("data:image/png") < 0) {
			//Android doesn't support data URI
			fallback = true;
		} else {
			var ctx = canvas.getContext("2d");
		}
	}

	var dpr = 1, bsr = 1;
		
	if(!fallback){
	    dpr = window.devicePixelRatio || 1,
	    bsr = ctx.webkitBackingStorePixelRatio || ctx.mozBackingStorePixelRatio || ctx.msBackingStorePixelRatio || ctx.oBackingStorePixelRatio || ctx.backingStorePixelRatio || 1;
	}

	var ratio = dpr / bsr;

	var fluid_images = [];

	var settings = {
		domain: "holder.js",
		images: "img",
		bgnodes: ".holderjs",
		themes: {
			"gray": {
				background: "#eee",
				foreground: "#aaa",
				size: 12
			},
			"social": {
				background: "#3a5a97",
				foreground: "#fff",
				size: 12
			},
			"industrial": {
				background: "#434A52",
				foreground: "#C2F200",
				size: 12
			}
		},
		stylesheet: ".holderjs-fluid {font-size:16px;font-weight:bold;text-align:center;font-family:sans-serif;margin:0}"
	};


	app.flags = {
		dimensions: {
			regex: /^(\d+)x(\d+)$/,
			output: function (val) {
				var exec = this.regex.exec(val);
				return {
					width: +exec[1],
					height: +exec[2]
				}
			}
		},
		fluid: {
			regex: /^([0-9%]+)x([0-9%]+)$/,
			output: function (val) {
				var exec = this.regex.exec(val);
				return {
					width: exec[1],
					height: exec[2]
				}
			}
		},
		colors: {
			regex: /#([0-9a-f]{3,})\:#([0-9a-f]{3,})/i,
			output: function (val) {
				var exec = this.regex.exec(val);
				return {
					size: settings.themes.gray.size,
					foreground: "#" + exec[2],
					background: "#" + exec[1]
				}
			}
		},
		text: {
			regex: /text\:(.*)/,
			output: function (val) {
				return this.regex.exec(val)[1];
			}
		},
		font: {
			regex: /font\:(.*)/,
			output: function (val) {
				return this.regex.exec(val)[1];
			}
		},
		auto: {
			regex: /^auto$/
		}
	}

	for (var flag in app.flags) {
		if (!app.flags.hasOwnProperty(flag)) continue;
		app.flags[flag].match = function (val) {
			return val.match(this.regex)
		}
	}

	app.add_theme = function (name, theme) {
		name != null && theme != null && (settings.themes[name] = theme);
		return app;
	};

	app.add_image = function (src, el) {
		var node = selector(el);
		if (node.length) {
			for (var i = 0, l = node.length; i < l; i++) {
				var img = document.createElement("img")
				img.setAttribute("data-src", src);
				node[i].appendChild(img);
			}
		}
		return app;
	};

	app.run = function (o) {
		var options = extend(settings, o),
		    images = [], imageNodes = [], bgnodes = [];
		    
		if(typeof(options.images) == "string"){
		    imageNodes = selector(options.images);
		}
		else if (window.NodeList && options.images instanceof window.NodeList) {
			imageNodes = options.images;
		} else if (window.Node && options.images instanceof window.Node) {
			imageNodes = [options.images];
		}

		if(typeof(options.bgnodes) == "string"){
		    bgnodes = selector(options.bgnodes);
		} else if (window.NodeList && options.elements instanceof window.NodeList) {
			bgnodes = options.bgnodes;
		} else if (window.Node && options.bgnodes instanceof window.Node) {
			bgnodes = [options.bgnodes];
		}

		preempted = true;

		for (i = 0, l = imageNodes.length; i < l; i++) images.push(imageNodes[i]);

		var holdercss = document.getElementById("holderjs-style");
		if (!holdercss) {
			holdercss = document.createElement("style");
			holdercss.setAttribute("id", "holderjs-style");
			holdercss.type = "text/css";
			document.getElementsByTagName("head")[0].appendChild(holdercss);
		}
		
		if (!options.nocss) {
		    if (holdercss.styleSheet) {
			    holdercss.styleSheet.cssText += options.stylesheet;
		    } else {
			    holdercss.appendChild(document.createTextNode(options.stylesheet));
		    }
		}

		

		var cssregex = new RegExp(options.domain + "\/(.*?)\"?\\)");

		for (var l = bgnodes.length, i = 0; i < l; i++) {
			var src = window.getComputedStyle(bgnodes[i], null)
				.getPropertyValue("background-image");
			var flags = src.match(cssregex);
			var bgsrc = bgnodes[i].getAttribute("data-background-src");

			if (flags) {
				var holder = parse_flags(flags[1].split("/"), options);
				if (holder) {
					render("background", bgnodes[i], holder, src);
				}
			}
			else if(bgsrc != null){
			    var holder = parse_flags(bgsrc.substr(bgsrc.lastIndexOf(options.domain) + options.domain.length + 1)
					.split("/"), options);
			    if(holder){
				render("background", bgnodes[i], holder, src);
			    }
			}
		}

		for (l = images.length, i = 0; i < l; i++) {
		    
			var attr_src = attr_data_src = src = null;
			
			try{
			    attr_src = images[i].getAttribute("src");
			    attr_datasrc = images[i].getAttribute("data-src");
			}catch(e){}
					
			if (attr_datasrc == null && !! attr_src && attr_src.indexOf(options.domain) >= 0) {
				src = attr_src;
			} else if ( !! attr_datasrc && attr_datasrc.indexOf(options.domain) >= 0) {
				src = attr_datasrc;
			}
			
			if (src) {
				var holder = parse_flags(src.substr(src.lastIndexOf(options.domain) + options.domain.length + 1)
					.split("/"), options);
				if (holder) {
					if (holder.fluid) {
						fluid(images[i], holder, src);
					} else {
						render("image", images[i], holder, src);
					}
				}
			}
		}
		return app;
	};

	contentLoaded(win, function () {
		if (window.addEventListener) {
			window.addEventListener("resize", fluid_update, false);
			window.addEventListener("orientationchange", fluid_update, false);
		} else {
			window.attachEvent("onresize", fluid_update)
		}
		preempted || app.run();
	});

	if (typeof define === "function" && define.amd) {
		define("Holder", [], function () {
			return app;
		});
	}

	})(Holder, window);
	
	return Holder;
});